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I think I get it. So this Caithness piece is probably very finely textured. I can see now that it's not completely smooth - I wasn't looking properly before (and of course it doesn't feel completely smooth either. Many thanks for all of the info John. Artifacts take on a new personality when you know a bit about them.

These weren't moulded, after adding colour and casing they were just swung on the blow-pipe to stretch them out, bonked on the ground to flatten the base and that's it. Quick and cheap to make. The texturing might be a deliberate experiment or it could be caused by cooling effect on the marver or whatever was used to flatten the base on the ground.

p.s. Just checked Marks books, confirms method. Form designed by Peter Fuin. Ken Wainwright did do some 'presumably 'experimental textured pieces in Oban... but much more pronounced... technique explained in book, so perhaps this falls into the same category. So far undocumented.

It would not actually be the floor, would be something on it, wad of wet paper or wood. Not likely to be the cause of texture. Picture is not clear enough for my eyes to really see the texture. So could not say for sure if this is an accidental (unlikely but not impossible) or deliberate texturing.

I've been reading an article by Mark Hill which says that the Oban range was designed by Charles Orr in the 1970s. Does anyone know if this range is still in production or did it end in the '70s? (I've tried to find out on line but no luck.) Thanks.